CN216210701U - Output control system for programmable power supply - Google Patents
Output control system for programmable power supply Download PDFInfo
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- CN216210701U CN216210701U CN202122454843.7U CN202122454843U CN216210701U CN 216210701 U CN216210701 U CN 216210701U CN 202122454843 U CN202122454843 U CN 202122454843U CN 216210701 U CN216210701 U CN 216210701U
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Abstract
The utility model belongs to the technical field of switching power supplies, and particularly relates to an output control system for a program-controlled power supply, which comprises: a power output control circuit and a constant current source control circuit; the input end of the power output control circuit is connected with the programmable power supply, and the output end of the power output control circuit is connected with the load; the constant current source control circuit is connected into the power output control circuit, namely the power output control circuit is suitable for outputting constant current to a load through the constant current source control circuit; the constant current source control circuit is connected into the power output control circuit, so that a resistor with a fixed resistance value can be replaced, the generated current is constant no matter how the voltage output by the power supply changes, the transient response speed of the power supply can be improved, and meanwhile, when the output is closed, the constant current source control circuit can also discharge the charge of the output capacitor at constant current, the transient response speed of the power supply is improved, and the safety is improved.
Description
Technical Field
The utility model belongs to the technical field of switching power supplies, and particularly relates to an output control system for a program-controlled power supply.
Background
If the switching power supply is unloaded, the output voltage is higher, so the switching power supply is provided with a dummy load. For a switching power supply with a constant voltage output, a fixed resistive load is often used.
It is difficult to adapt a fixed resistive load to a switching power supply with a wide voltage output for the following reasons: according to ohm's law I = U/R, when the resistance value of the resistor R is fixed and the output voltage is low, the current generated by the dummy load is small, the smaller the current is, the closer to no load is, the worse the stability of the whole system is, and when the output voltage is high, the current generated by the dummy load is large, and the efficiency of the whole system is affected.
Therefore, it is desirable to develop a new output control system for a programmable power supply to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an output control system for a programmable power supply, which aims to solve the problem of how to enable the programmable power supply to output constant current.
In order to solve the above technical problem, the present invention provides an output control system for a programmable power supply, comprising: a power output control circuit and a constant current source control circuit; the input end of the power output control circuit is connected with the programmable power supply, and the output end of the power output control circuit is connected with the load; the constant current source control circuit is connected into the power output control circuit, namely the power output control circuit is suitable for outputting constant current to a load through the constant current source control circuit.
In one embodiment, the power output control circuit includes: the controller, the first switch tube and the follow current inductor; the controller is electrically connected with the first switching tube; the first switching tube is connected with the follow current inductor in series so as to be connected into a power supply loop of the programmable power supply and the load; when the controller controls the first switching tube to be conducted, the programmable power supply supplies power to the load through the follow current inductor; and when the controller controls the first switching tube to be cut off, the programmable power supply stops supplying power to the load.
In one embodiment, the input end of the first switching tube and the output end of the follow current inductor are grounded through an input capacitor and an output capacitor respectively; the input capacitor and the output capacitor are respectively used for stabilizing the input voltage and the output voltage of the power output control circuit.
In one embodiment, a freewheeling diode connected in parallel with the input capacitor and the output capacitor is arranged between the first switching tube and the freewheeling inductor; when the controller controls the first switching tube to be conducted, the programmable power supply charges the output capacitor through the follow current inductor; when the controller controls the first switching tube to be cut off, the follow current inductor charges the output capacitor through the follow current diode, namely the on-state time of the first switching tube is divided by the whole switching period to be a duty ratio, and the controller regulates the duty ratio to stabilize the output voltage.
In one embodiment, the constant current source control circuit includes: the constant current device comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a constant current device and a field effect tube; the galvanostat is electrically connected with the field effect tube, and is connected to the input end of the first switching tube and the output end of the field effect tube connected to the follow-up current inductor; the first resistor is suitable for stabilizing the voltage input into the galvanostat and the field effect tube; the fourth resistor is suitable for controlling the output current of the galvanostat; the second resistor and the third resistor are suitable for driving the field effect tube to be switched on or switched off.
In one embodiment, the galvanostat is adapted to use a controllable regulated voltage source to output a constant current.
In one embodiment, the galvanostat comprises: the operational amplifier and a reference voltage electrically connected with the operational amplifier; the constant current output by the operational amplifier is equal to the voltage value of the reference voltage divided by the resistance value of the fourth resistor, namely, the output current of the operational amplifier is controlled by adjusting the resistance value of the fourth resistor.
In one embodiment, the galvanostat comprises: the precision operational amplifier and a precision reference voltage electrically connected with the precision operational amplifier; and the precise operational amplifier outputs corresponding constant current through precise reference voltage.
The utility model has the advantages that the constant current source control circuit is connected into the power output control circuit, a resistor with a fixed resistance value can be replaced, the generated current is constant no matter how the voltage output by the power supply changes, the transient response speed of the power supply can be improved, and meanwhile, when the output is closed, the constant current source control circuit can also discharge the charge of the output capacitor at constant current, the transient response speed of the power supply is improved, and the safety is improved.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a circuit diagram of an output control system for a programmable power supply of the present invention;
fig. 2 is a circuit diagram of the galvanostat of the present invention;
fig. 3 is a circuit diagram of another alternative embodiment of an output control system for a programmable power supply of the present invention.
In the figure:
the constant current device comprises a first switching tube Q1, a freewheeling inductor L1, an input capacitor C1, an output capacitor C2, a freewheeling diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a constant current device U1 and a field effect tube Q2.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In this embodiment, as shown in fig. 1 to 3, the present embodiment provides an output control system for a programmable power supply, including: a power output control circuit and a constant current source control circuit; the input end of the power output control circuit is connected with the programmable power supply, and the output end of the power output control circuit is connected with the load; the constant current source control circuit is connected into the power output control circuit, namely the power output control circuit is suitable for outputting constant current to a load through the constant current source control circuit.
In this embodiment, the constant current source control circuit is connected to the power output control circuit, so that a resistor with a fixed resistance value can be replaced, no matter how the voltage of the power output changes, the generated current is constant, the transient response speed of the power supply can be increased, and meanwhile, when the output is closed, the constant current source control circuit can also discharge the electric charge of the output capacitor C2 at a constant current, so that the transient response speed of the power supply is increased, and the safety is improved.
In this embodiment, the power output control circuit includes: the controller, the first switching tube Q1 and the follow current inductor L1; the controller is electrically connected with the first switching tube Q1; the first switching tube Q1 is connected in series with a follow current inductor L1 to be connected into a power supply loop of the programmable power supply and the load; when the controller controls the first switching tube Q1 to be conducted, the programmable power supply supplies power to the load through the freewheeling inductor L1; when the controller controls the first switching tube Q1 to be cut off, the programmable power supply stops supplying power to the load.
In this embodiment, the input terminal of the first switching tube Q1 and the output terminal of the freewheeling inductor L1 are grounded through an input capacitor C1 and an output capacitor C2, respectively; the input capacitor C1 and the output capacitor C2 are respectively used for stabilizing the input voltage and the output voltage of the power output control circuit.
In this embodiment, a freewheeling diode D1 connected in parallel with the input capacitor C1 and the output capacitor C2 is disposed between the first switching tube Q1 and the freewheeling inductor L1; when the controller controls the first switching tube Q1 to be switched on, the programmable power supply charges the output capacitor C2 through the freewheeling inductor L1; when the controller controls the first switching tube Q1 to be turned off, the freewheeling inductor L1 charges the output capacitor C2 through the freewheeling diode D1, that is, the on-time of the first switching tube Q1 is divided by the whole switching period to be the duty ratio, and the controller regulates the duty ratio to stabilize the output voltage.
In this embodiment, the controller is further provided with a feedback loop connected to a power supply loop of the programmable power supply and the load, a buck step-down power supply topology is formed by the controller, the feedback loop, the input capacitor C1, the first switching tube Q1, the freewheeling diode D1, the freewheeling inductor L1 and the output capacitor C2, the input capacitor C1 is used for stabilizing input voltage, the output capacitor C2 is used for stabilizing output voltage, when the controller controls the first switching tube Q1 to be turned on, the programmable power supply charges the output capacitor C2 through the freewheeling inductor L1, when the controller controls the first switching tube Q1 to be turned off, the freewheeling inductor L1 freewheels to charge the output capacitor C2 through the freewheeling diode D1, the on time of the first switching tube Q1 is divided by the whole switching period, which is a duty ratio, and the controller stabilizes the output voltage by adjusting the duty ratio.
In this embodiment, the constant current source control circuit includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a galvanostat U1 and a field effect transistor Q2; the galvanostat U1 is electrically connected with the field effect transistor Q2, the galvanostat U1 is connected to the input end of the first switch tube Q1, and the field effect transistor Q2 is connected to the output end of the follow current inductor L1; the first resistor R1 is suitable for stabilizing the voltage of the input galvanostat U1 and the field effect transistor Q2; the fourth resistor R4 is suitable for controlling the output current of the galvanostat U1; the second resistor R2 and the third resistor R3 are suitable for driving the field effect transistor Q2 to be switched on or switched off.
In this embodiment, the galvanostat U1 is adapted to use a controllable regulated voltage source to output a constant current.
In this embodiment, as an alternative embodiment of the galvanostat U1, as shown in fig. 1 to 2, the galvanostat U1 includes: the operational amplifier and a reference voltage electrically connected with the operational amplifier; the constant current output by the operational amplifier is equal to the voltage value of the reference voltage divided by the resistance value of the fourth resistor R4, i.e. the output current of the operational amplifier is controlled by adjusting the resistance value of the fourth resistor R4.
In this embodiment, the operational amplifier and the reference voltage may be replaced by a controllable voltage regulator TL431 chip, the controllable voltage regulator TL431 chip has an operational amplifier and a reference voltage of 2.5V inside, a 1 pin of the chip is REF, a 2 pin of the chip is catode, a 3 pin of the chip is ANODE, a 1 pin of the constant current source U1 is 2.5V in normal operation, a voltage value (2.5V in this embodiment) where the output current of the constant current source control circuit is the reference voltage is divided by a resistance value of the fourth resistor R4, and the magnitude of the constant current can be changed by adjusting the resistance value of the fourth resistor R4; the second resistor R2 and the third resistor R3 are driving resistors of a field effect transistor Q2; the constant current device U1 uses a controllable voltage-stabilizing source TL431 chip, saves cost, reduces space occupation and is suitable for all power supply topologies compared with a constant current source using a precision operational amplifier and a precision reference.
In this embodiment, as another alternative embodiment of the galvanostat U1, as shown in fig. 3, the galvanostat U1 includes: the precision operational amplifier and a precision reference voltage electrically connected with the precision operational amplifier; and the precise operational amplifier outputs corresponding constant current through precise reference voltage.
In summary, the constant current source control circuit is connected to the power output control circuit, so that the resistor with a fixed resistance value can be replaced, the generated current is constant no matter how the voltage output by the power supply changes, the transient response speed of the power supply can be improved, and meanwhile, when the output is closed, the constant current source control circuit can also discharge the charge of the output capacitor at a constant current, the transient response speed of the power supply is improved, and the safety is improved.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation. Moreover, the software programs referred to in the present application are all prior art, and the present application does not relate to any improvement of the software programs.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. An output control system for a programmable power supply, comprising:
a power output control circuit and a constant current source control circuit; wherein
The input end of the power output control circuit is connected with the programmable power supply, and the output end of the power output control circuit is connected with the load;
the constant current source control circuit is connected into the power output control circuit, namely
The power output control circuit is adapted to output a constant current to a load through a constant current source control circuit.
2. The output control system for a programmable power supply of claim 1,
the power output control circuit includes: the controller, the first switch tube and the follow current inductor;
the controller is electrically connected with the first switching tube;
the first switching tube is connected with the follow current inductor in series so as to be connected into a power supply loop of the programmable power supply and the load;
when the controller controls the first switching tube to be conducted, the programmable power supply supplies power to the load through the follow current inductor;
and when the controller controls the first switching tube to be cut off, the programmable power supply stops supplying power to the load.
3. The output control system for a programmable power supply of claim 2,
the input end of the first switch tube and the output end of the follow current inductor are grounded through an input capacitor and an output capacitor respectively;
the input capacitor and the output capacitor are respectively used for stabilizing the input voltage and the output voltage of the power output control circuit.
4. The output control system for a programmable power supply of claim 3,
a freewheeling diode connected with the input capacitor and the output capacitor in parallel is arranged between the first switching tube and the freewheeling inductor;
when the controller controls the first switching tube to be conducted, the programmable power supply charges the output capacitor through the follow current inductor;
when the controller controls the first switch tube to be cut off, the follow current inductor charges the output capacitor through the follow current diode, namely
The conduction time of the first switching tube is divided by the whole switching period to be the duty ratio, and the controller is used for stabilizing the output voltage by adjusting the duty ratio.
5. The output control system for a programmable power supply of claim 2,
the constant current source control circuit includes: the constant current device comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a constant current device and a field effect tube;
the galvanostat is electrically connected with the field effect tube, and is connected to the input end of the first switching tube and the output end of the field effect tube connected to the follow-up current inductor;
the first resistor is suitable for stabilizing the voltage input into the galvanostat and the field effect tube;
the fourth resistor is suitable for controlling the output current of the galvanostat;
the second resistor and the third resistor are suitable for driving the field effect tube to be switched on or switched off.
6. The output control system for a programmable power supply of claim 5,
the galvanostat is suitable for adopting a controllable voltage-stabilizing source to output constant current.
7. The output control system for a programmable power supply of claim 5,
the galvanostat includes: the operational amplifier and a reference voltage electrically connected with the operational amplifier;
the constant current output by the operational amplifier is equal to the voltage value of the reference voltage divided by the resistance value of the fourth resistor, namely
The output current of the operational amplifier is controlled by adjusting the resistance value of the fourth resistor.
8. The output control system for a programmable power supply of claim 5,
the galvanostat includes: the precision operational amplifier and a precision reference voltage electrically connected with the precision operational amplifier;
and the precise operational amplifier outputs corresponding constant current through precise reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122454843.7U CN216210701U (en) | 2021-10-12 | 2021-10-12 | Output control system for programmable power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122454843.7U CN216210701U (en) | 2021-10-12 | 2021-10-12 | Output control system for programmable power supply |
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| CN216210701U true CN216210701U (en) | 2022-04-05 |
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| CN202122454843.7U Active CN216210701U (en) | 2021-10-12 | 2021-10-12 | Output control system for programmable power supply |
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